What is CVE-2009-4307?

CVE-2009-4307 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10. CVE-2009-4307 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2009-4307?

CVE-2009-4307 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is AV:N/AC:M/Au:N/C:N/I:N/A:C.

Is there a patch available for CVE-2009-4307?

No patch is currently available for CVE-2009-4307. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2009-4307 actively exploited?

CVE-2009-4307 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2009-4307

High

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 2.6.32-git6 allows user-assisted remote attackers to cause a denial of service (divide-by-zero error and panic) via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value).

Package Linux Kernel

Published 2009-12-13

Last modified 2026-04-23

CVSS version 2.0

Patch available

Awaiting data

CVSS 2.0 score

7.1

out of 10

High

Attack Vector

Network

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

None

Integrity

None

Availability

Vector string

AV:N/AC:M/Au:N/C:N/I:N/A:C

Weakness type

CWE-189

CVE-2009-4307 is classified as CWE-189

See CWE-189 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2009-4307 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Lists
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
Lists
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00005.html
Lkml
http://lkml.org/lkml/2009/12/9/255
Secunia
http://secunia.com/advisories/37658

Vendor Advisory
Secunia
http://secunia.com/advisories/38017
Secunia
http://secunia.com/advisories/38276
Mandriva
http://www.mandriva.com/security/advisories?name=MDVSA-2011:029
Red Hat
http://www.redhat.com/support/errata/RHSA-2010-0380.html
Oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9874
Kernel patch commit
http://bugzilla.kernel.org/show_bug.cgi?id=14287
Patch
Kernel patch commit
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=503358ae01b70ce6909d19dd01287093f6b6271c
Patch
Kernel patch commit
http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.32-git6.log
Patch

Details

CVE ID CVE-2009-4307

Severity High

CVSS score 7.1 / 10

CVSS version 2.0

Published 2009-12-13

Modified 2026-04-23

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2009-4307?

CVE-2009-4307 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 . CVE-2009-4307 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2009-4307?

CVE-2009-4307 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 2.0). The vector string is AV:N/AC:M/Au:N/C:N/I:N/A:C.
Is there a patch available for CVE-2009-4307?

No patch is currently available for CVE-2009-4307. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2009-4307 actively exploited?

No — CVE-2009-4307 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.